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Differentiel d’Egalite / Greubel Forsey

The Greubel Forsey Differentiel d’Egalite is an example of a certain tradition of horological experimentation: research into a means by which energy which doesn’t vary can be delivered to the escapement. The verge, which was the first known escapement, was very sensitive to power variations and was often paired with early constant force devices such as the fusee or the stackfreed. The more sophisticated but much more complex remontoire is another example and variations on this device are among the most interesting mechanisms in horology — via Hodinkee